(Temp) UI only renders to backbuffer

src/dawn/display/RenderPipeline.cpp

@@ -130,21 +130,23 @@ void RenderPipeline::renderSceneCamera(Scene *scene, Camera *camera) {
   }
   
   // UI Elements
-  auto canvases = scene->findComponents<UICanvas>();
-  auto itCanvas = canvases.begin();
-  while(itCanvas != canvases.end()) {
-    auto canvas = *itCanvas;
-    glm::mat4 projection;
-    glm::mat4 view;
-    canvas->getProjectionAndView(&projection, &view);
+  if(renderTarget == this->renderManager->getBackBuffer()) {
+    auto canvases = scene->findComponents<UICanvas>();
+    auto itCanvas = canvases.begin();
+    while(itCanvas != canvases.end()) {
+      auto canvas = *itCanvas;
+      glm::mat4 projection;
+      glm::mat4 view;
+      canvas->getProjectionAndView(&projection, &view);
 
-    auto renderables = canvas->item->findChildrenDeep<UIComponentRenderable>();
-    auto itChild = renderables.begin();
-    while(itChild != renderables.end()) {
-      vectorAppend(&shaderPassItems,(*itChild)->getPassItems(projection, view));
-      ++itChild;
+      auto renderables = canvas->item->findChildrenDeep<UIComponentRenderable>();
+      auto itChild = renderables.begin();
+      while(itChild != renderables.end()) {
+        vectorAppend(&shaderPassItems,(*itChild)->getPassItems(projection, view));
+        ++itChild;
+      }
+      ++itCanvas;
     }
-    ++itCanvas;
   }
 
   // Debug Lines

src/dawn/scene/components/display/CMakeLists.txt

@@ -12,6 +12,7 @@ target_sources(${DAWN_TARGET_NAME}
     PixelPerfectCamera.cpp
     TiledSprite.cpp
     SimpleRenderTargetQuad.cpp
+    CameraTexture.cpp
 )
 
 add_subdirectory(mesh)

src/dawn/scene/components/display/CameraTexture.cpp

@@ -0,0 +1,24 @@
+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#include "CameraTexture.hpp"
+
+using namespace Dawn;
+
+CameraTexture::CameraTexture(SceneItem *item) :
+  SceneItemComponent(item),
+  camera(nullptr),
+  renderTarget(32.0f, 32.0f)
+{
+}
+
+void CameraTexture::onStart() {
+  if(this->camera == nullptr) this->camera = item->getComponent<Camera>();
+
+  useEffect([&]{
+    if(this->camera == nullptr) return;
+    this->camera->renderTarget = &this->renderTarget;
+  }, this->camera)();
+}

src/dawn/scene/components/display/CameraTexture.hpp

@@ -0,0 +1,22 @@
+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include "scene/components/display/Camera.hpp"
+#include "display/TextureRenderTarget.hpp"
+
+namespace Dawn {
+  class CameraTexture : public SceneItemComponent {
+    protected:
+
+    public:
+      StateProperty<Camera*> camera;
+      TextureRenderTarget renderTarget;
+
+      CameraTexture(SceneItem *item);
+
+      void onStart() override;
+  };
+}

src/dawn/scene/components/ui/UIComponent.cpp

@@ -37,6 +37,8 @@ void UIComponent::updateAlignment() {
   auto dimensional = this->getParentDimensional();
   auto translate = this->transform->getLocalPosition();
 
+  assertNotNull(dimensional);
+
   float_t parentWidth, parentHeight;
   parentWidth = dimensional->getWidth();
   parentHeight = dimensional->getHeight();

src/dawnliminal/scenes/HelloWorldScene.hpp

@@ -5,9 +5,11 @@
 
 #pragma once
 #include "scene/Scene.hpp"
-#include "scene/components/display/Camera.hpp"
+#include "scene/components/display/CameraTexture.hpp"
 #include "prefabs/SimpleSpinningCubePrefab.hpp"
 #include "prefabs/VNTextbox.hpp"
+#include "display/TextureRenderTarget.hpp"
+#include "scene/components/ui/UIImage.hpp"
 
 namespace Dawn {
   class HelloWorldScene : public Scene {
@@ -15,6 +17,7 @@ namespace Dawn {
       Camera *camera;
       Camera *camNew;
       UICanvas *canvas;
+      TextureRenderTarget *renderTarget;
       Texture text;
 
       int32_t test = 0;
@@ -24,17 +27,27 @@ namespace Dawn {
         
         camera = Camera::create(this);
         camera->fov = 0.436332f;
-        camera->transform->lookAt(glm::vec3(10, 10, 10), glm::vec3(0, 0, 0));
+        camera->transform->lookAt(glm::vec3(900, 900, 900), glm::vec3(800, 800, 800));
 
         camNew = Camera::create(this);
+        auto camTexture = camNew->item->addComponent<CameraTexture>();
         camNew->transform->lookAt(glm::vec3(10, 10, 10), glm::vec3(0, 0, 0));
-        camNew->renderTarget = nullptr;
+        camTexture->renderTarget.setSize(256, 256);
 
         auto cube = SimpleSpinningCubePrefab::create(this);
 
         auto textbox = VNTextbox::create(this);
         textbox->transform.setParent(canvas->transform);
 
+        auto uiTest = this->createSceneItem();
+        uiTest->transform.setParent(canvas->transform);
+        auto image = uiTest->addComponent<UIImage>();
+        image->texture = camTexture->renderTarget.getTexture();
+        image->alignment = glm::vec4(0, 0, 50, 0);
+        image->alignX = UI_COMPONENT_ALIGN_START;
+        image->alignUnitRight = UI_COMPONENT_ALIGN_UNIT_PERCENT;
+        image->alignY = UI_COMPONENT_ALIGN_STRETCH;
+
         struct Color colors[] = {
           COLOR_BLUE, COLOR_MAGENTA, COLOR_WHITE,
           COLOR_MAGENTA, COLOR_CORNFLOWER_BLUE, COLOR_MAGENTA,